diff --git a/pyproject.toml b/pyproject.toml
index e0c077a6..2c71b953 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,7 +48,7 @@ smolagents = [
 ]
 
 a2a = [
-  "a2a-sdk>=0.3.0,<1.0.0",
+  "a2a-sdk>=0.3.0,<2.0.0",
   "httpx",
 ]